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Report - - Browns Folly & Farleigh Down Tunnel - Feb 2012 | Mines and Quarries | 28DaysLater.co.uk

Report - Browns Folly & Farleigh Down Tunnel - Feb 2012



Chaos

28DL Regular User
Regular User
#1
A bit of history about Brown's Folly Quarry

Browns Folly Mine is an SSSI (Special Site of Scientific Interest) because of its national importance for hibernating and roosting bats.

Brown's Folly is a tower situated near Bathford overlooking Bath. Beneath the folly in the nature reserve are the entrances to part of Brown's Folly Quarry. This stone mine is fairly big but not too complicated.

The southern section consists of several long main routes, the waste stone is stacked up along the sides of the passages. There are few roof falls in this mine, probably due to good strong pillars at regular intervals.

The main adit into the quarry was blasted by the military probably to prevent access to the Monkton Farleigh Ammunition Depot connected to Brown's Folly.

In the Southern section there exists some stables amongst other interesting features. Further into the hillside there is an area known as Clapham Junction, so called because of the rails laid in the floor. This was the junction of several routes into the different headings of the mine. The existence of rails means that this was a relatively recent and large mine.
Another trip up to Wiltshire to meet up with Rookinella and do a bit of underground exploring along with a couple of friends who are non members.

Rooks had taken a fall down some stairs only a couple of days before and broke a toe so was on crutches with a very swollen foot. I offered rearrange for another day but she insisted to come along.

This made for some interesting moments trying to get her up some snow covered woodland slopes on the way to our entrance!!

I didn't take loads of pictures but decided to mess about a bit with lighting and make use of a UV torch that I'd got from eBay.

Enjoy!

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Our next stop was Farleigh Down tunnel. As part of the war effort a large stone quarry in Monkton Farleigh was converted in to an ammunition depot, the depot was situated under a hill top, a mile away and 450 feet above the old quarry stone yard sidings on main GWR line at Ashley, this was the main source of the ammunition. Sidings existed on the site since 1881 when a tramway from the quarry brought stone down the hill for shipment on the GWR. Alternative means of transporting the ammunition was required due to poor road access, this was because by road it was a 4 mile journey through winding lanes between the depot and the sidings.

In November 1937 a 300 meter long platform was constructed complete with a narrow gauge tracks to carry the ammunition wagons. Plans to lay a tunnel in to the depot were laid down however the depot needed to be brought in to use so in the meantime work started on a 1.8km long aerial ropeway which carried the ammunition from to a from the sidings up the hill to a large loading platform near District 20 of the depot. This allowed the depot to be brought in to use while the tunnel was being constructed.

The tunnel was designed to handle 1000 tons of ammunition wach day, it provide a secure route for the ammunition in to the site and it was practically invisible from the air. A 30 foot deep slopeshaft was sunk at the sidings which became the start of the tunnel which connected at quarry floor level in the depot on one of the main haulage ways. The tunnel is at a constant gradient as it travels up the hill to the depot.

Half of the tunnel was bored nearer the top of the hill where it met a depth of roughly 180 feet below ground, half way down the technique was changed and a trench was opened in to this square box sections of tunnel were laid and re-covered. Most of this section of the tunnel was barely underground, some of it was even partially above the surface level and had to be disguised by forming gently sloping mounds of earth over it.

A conveyor belt was installed in the tunnel which could transport the ammunition at 250 feet per minute, at the sidings end of the tunnel was an underground marshalling yard where the ammunition would be loaded on to narrow gauge carts and then taking up the slopeshaft to the platform aided by a mechanical tram creeper. The ammunition could then be moved from the carts in to railways carriages for distribution.

The aerial ropeway to the depot continued to be maintained after the tunnel came in to action. This was in case the tunnel's conveyors ever broke down and a backup was needed. Approaching D-day with high flows of ammunition the tunnel and the rope way was used to handle the massive amounts of ammunition required for the invasion of Europe.

We decided to walk all the way to the end of the tunnel knowing full well it would be blocked but we wanted to do it anyway and this is what we saw when we got to the end.

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On the way back we played with light again and took a few more snaps.

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Finally, a picture of the sidings

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